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I <br /> i <br /> 4 i <br /> Project No 58080-06-02 <br /> May 5, 1995 <br /> r <br /> ' TPHd was reported in wells MW-1, MW-3, MW-4 and MW-5 at concentrations ranging from 52 <br /> ug/L (MW-4) to 190 ug/L (MW-3) The laboratory reports for TPHd indicate that for those <br /> ' groundwater samples with detectable petroleum hydrocarbons, the chromatogram pattern is one of <br /> "unidentified hydrocarbons" with carbon ranging from C9 to C21 <br /> MTBE was detected in wells MW-1 MW-3 and MW-5 with the highest concentration present in <br /> ' offsite upgradient well MW-5 at a concentration of 610 ug/L <br /> ' VOC's DCA, TCE and PCE were detected in most wells with detectable concentrations ranging <br /> froth 1 1 to 41 ug/L for DCA, 0 82 to 2 2 ug/L for TCE and 1 1 to 13 ug/L for PCE DCE was <br /> ' not detected in any of the wells sampled <br /> 36 Vapor Extraction Pilot Test <br /> VET field and laboratory analytical data are summarized in Table VI Utilizing the VET system, <br />' extraction flowrates ranging from 27 to 67 standard cubic feet per minute (scfm) were achieved <br /> from extraction wells VW-1 and VW-6 The maximum achievable flowrate from extraction well <br />' VW-1 was 36 scfm with an associated vacuum of 45 inches of water column (inches H2O) For <br /> extraction well VW-6 the maximum achievable flowrate was 67 scfm at a vacuum of 15 inches H2O <br /> While extracting from VW-1 at 27 scfm, vacuum responses ranging from 0 60 to 0 75 inches H2O <br /> were recorded at MW-2 which is located approximately 50 feet from VW-1 The range of vacuum <br /> response at 27 scfm was 0 60 inches H2O (MW-2) to 1 75 inches H2O (MW-3) While extracting <br />' from VW-6 at 67 scfm, vacuum responses ranging from 0 23 to 0 37 inches H2O were recorded at <br /> MW-5 which is located approximately 102 feet from VW-6 The range of vacuum response at 29 <br />' scfm was 0 22 inches H2O (MW-5) to 1 30 inches H2O (VW-2) <br /> -19- <br />